Mayo Clinic: Jackson Has Bipolar Depression

A release Monday from the Mayo Clinic states that the Democrat underwent an extensive evaluation and is responding well to treatment for the disorder at the facility in Rochester, Minn. The release says Jackson is regaining his strength.

Jackson spokesman Frank Watkins declined to comment.

The clinic says that Bipolar II disorder is a treatable condition that affects parts of the brain controlling emotion, thought and drive and is likely caused by a complex set of genetic and environmental factors.

Jackson has been away from the public eye since June 10 when family members said he collapsed at their Washington home. He's been on an extended leave of absence from Congress.